Vintage 12" STERLING Triangular Drafting Architects Scale Ruler

Vintage Dietzgen Architects' 12" Triangular Scale Ruler 1656B Excello

Vintage 12" PICKETT P-232E-ES Triangular Drafting Architects Scale Ruler

Vintage Architects Scale Drafting Triangular Ruler Engineer 12" Lot of 6

Vintage Dietzgen Engineer’s 12 in. Triangular Scale Ruler 1667BP USA

Dietzgen 1626 Wooden VTG 3 Sided Triangular 12" Ruler Scale Drafting Vintage USA

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(2) Dietzgen Excello Drafting Ruler 1590 Vintage 12" Length USA Made 1590, 1593D